Help i don’t understand

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

If two objects at different te,peraure are in contact with each other what happens to their temperature

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?